Employee Benefit Plan - Change in Projected Benefit Obligation and Pan Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of year	$ 26,741	$ 25,828
Service cost	225	889	3,059
Interest cost	653	712	1,225
Actuarial (gain) loss	(888)	3,059
Benefits paid	(101)	(29)
Settlement loss	(3,099)	(3,718)
Projected benefit obligation, end of year	23,531	26,741	25,828
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of assets, beginning of year	60,097	60,953
Actual return on assets	2,378	3,543
Settlements	(3,099)	(3,718)
Benefits and expenses paid	(728)	(681)
Fair value of assets, end of year	58,648	60,097	60,953
Funded status at end of year	$ 35,117	$ 33,356
Ratio of plan assets to projected benefit obligation	249.00%	225.00%